Module exists and cannot be found

[James Moe]

python 3.6.10
opensuse tumbleweed
linux 5.8.4

An old program based on Python (BackInTime) has recently been having
difficulties functioning. See below.

Module PyQt5 is most definitely installed. Apparently there is more to getting
modules loaded than there used to be.

(Also, I am not familiar with Python.)

----[ error message (verbose option) ]----
Traceback (most recent call last):
  File "/home/jmoe/diy/backintime-master/qt/app.py", line 35, in <module>
    import qttools
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/jmoe/diy/backintime-master/qt/qttools.py", line 21, in <module>
    from PyQt5.QtGui import (QFont, QColor, QKeySequence)
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 941, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'PyQt5'
----[ end ]----

----[ the 1st code lines causing the above ]----
qttools.py:
  import os
  import sys
  import gettext
  from PyQt5.QtGui import (QFont, QColor, QKeySequence) <<<-- line 21
  ...

app.py:
  import os
  import sys

  if not os.getenv('DISPLAY', ''):
    os.putenv('DISPLAY', ':0.0')

  import datetime
  import gettext
  import re
  import subprocess
  import shutil
  import signal
  from contextlib import contextmanager
  from tempfile import TemporaryDirectory

  import qttools    <<<--- line 35
  qttools.registerBackintimePath('common')
  ...
----[ end ]----

-- 
James Moe
jmm-list at sohnen-moe dot com
Think.